<template>
  <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

      <!-- 卡片视图 -->
      <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="catelist" expand-trigger="hover" :props="cateProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
             <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox> 
              </el-checkbox-group>
             </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品照片" name="3">
            <!-- action 表示图片要上传到的后台API后台地址 -->
            <el-upload  :action="onlyTableData" :on-preview="handlePreview" :on-remove="handleRemove"  list-type="picture" :headers="headerObj" :on-success="handleSuccess">
            <el-button size="small" type="primary">点击上传</el-button>
          </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
      </el-card>

      <!-- 图片预览的对话框 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%" >
      <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  data() {
    return{
      activeIndex:'0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        // 商品所属的分类数组
        goods_cat:[],
        // 图片的数组
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        // 商品所属的参数信息
        attrs:[]
      },
      addFormRules: {
        goods_name:[
          { required:true,message:'请输入商品名称',trigger:'blur' }
        ],
        goods_price:[
          { required:true,message:'请输入商品价格',trigger:'blur' }
        ],
        goods_weight:[
          { required:true,message:'请输入商品重量',trigger:'blur' }
        ],
        goods_number:[
          { required:true,message:'请输入商品数量',trigger:'blur' }
        ],
        goods_cat:[
          {required:true,message:'请选择商品分类',trigger:'blur'}
        ]
      },
      // 商品分类列表
      catelist:[],
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      // 动态参数列表数据
      manyTableData:[],
      // 静态属性的数据
      onlyTableData:[],
      // 上传图片的URL地址
      uploadURL:'http://localhost:8888/api/private/v1/upload',
      // 图片上传组件的headers 请求头对象
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      previewPath:'',
      previewVisible:false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const {data:res} = await this.$http.get('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败')
      }
      this.catelist = res.data
    },
    // 级联选择器选中项变化 会触发这个函数
    handleChange() {
      if(this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTableave(activeName,oldActiveName) {
      if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // 点击tab栏时触发
    async tabClicked() {
      // 证明访问的是动态参数面板
      if(this.activeIndex === '1') {
        const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
          params:{sel:'many'}
        })
        if(res.meta.status !== 200) {
          return this.$message.error('获取动态参数数据失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] :item.attr_vals.split('')
        })
        this.manyTableData = res.data
      }else if(this.activeIndex === '2')
      {
        const {data:res} = await this.$http.get
          (`categories/${this.cateId}/attributes`,{
          params:{sel:'only'}
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数数据失败')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 在pics数组中，找到对应的图片信息对象索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 通过splice方法，把图片信息对象从pics中移除
      this.addForm.pics.splice(i,1)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // 1. 先拼接得到一个图片信息对象
      const picInfo = {pic:response.data.tmp_path}
      // 2. 将图片信息对象 push 到pics数组中
      this.addForm.pics.push(picInfo)

    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if(!valid)  {
          return this.$message.error('请填写必要的表单项!')
        }
        // 执行添加的业务逻辑
        // lodash cloneDeep(obj) 深拷贝
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        // 发起请求添加商品
        // 商品的名称,必须是唯一的
        const {data:res} = await this.$http.post('goods',form)
        if(res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed:{
    cateId() {
      if(this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>